YANTRA HARVEST
Meduim Voltage
Drives
YANTRA HARVEST ENERGY PVT. LTD.
Office No. 101, 102, 103, Plot No. 84, Survey No. 40,
Ambedkar Road, Sangamwadi, Near RTO Office,
Pune - 411001 (India)
Tel / Fax : +91 20 26053200
E-mail - sales@yantraharvest.com,
www.yantraharvest.com
Introduction
Yantra-Harvest, a winning
partnership of experience,
technology and achievements
in the Indian automation
industry, now introduce
HARSVERT-A, the new
generation VFD from Yantra Harvest which is a multi-cell VFD
with series-connect units, high
voltage input and output.
Beijing Leader & Harvest
Electric Technologies co. Ltd is
YANTRA HARVEST
a high-technology company
specializing in the R&D,
manufacture, sales and service
of medium voltage variable
frequency system. Today, Beijing
Leader is a market leader in the
manufacture of VFDs in China,
having catapulted to
great heights within a short span
of 5 years. They are an ISO
9001:2000 company, with a
spectacular sales record to their
credit. With a manufacturing unit
in the Changping Yangfang
Industrial Area of Beijing Leader &
Harvest has always endeavored
to meet the growing need of users
and foster technological
advance. Beijing Leader & Harvest
has installed more than 3000 MV
Drives which are working
satisfactorily in various industry
segments.
Capabilities
Yantra primary technical services include
automation and electrical engineering design,
systems analysis, testing and support, systems
integration, field service and commissioning,
control, monitoring, testing and repair, with
expertise in industries like:
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Oil and Gas
Chemical and Petro-chemical Plants
Automotive Plants
Steel Plants
Nylon and Tyre cord Plants
Water and Effluent Treatment
Power Generation and Utilities
Pulp and Paper
Pharmaceutical Industries
Food and Beverages
Textile
Consumer Products
Yantra is India's first company to have
executed the largest MV Drive projects in India
for MRPL and HPCL.
LEADER & HARVEST has tirelessly endeavored to
develop the medium voltage variable frequency
drive (VFD) with high technology for years,
meeting many challenges and quality demands
in China. The products have passed the
demanding test and inspection of the National
Electrical Control Distribution Equipment Quality
Supervision Inspection Center and the China
Electric Power Research Institute as well as the
product appraisal of the State Bureau of
Machine Building Industry to obtain the Appraisal
and Approval Certificate of New Product and
New Technology granted by the State Economic
and Trade Commission. LEADER & HARVEST relies
on the first class technology foundation of a
State Key Laboratory (Tsinghua University) and its
experienced R & D team that continuously
focuses on innovation and high quality. Their
technical know-how and diligence has resulted
in high-tech products, and after exploring market
demands they have teamed up with production
to introduce newer and better products.
Harnessing power, harvesting profits
Application of
HARSVERT-A medium
voltage VFD series
Power generation:
Boiler feed Pumps
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Condenser water pump,
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I D Fans
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F D Fans
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P A Fans
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CW Pump
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Metal:
Dusting Fans,
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Furnace Fans
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Descaling Pumps
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Converter ID Fans
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Petrochemical and chemical:
Oil Transfer Pumps
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Compressors
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City construction:
Water-supply Pump
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Compressors
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Mining:
YANTRA HARVEST
Mortar Pumps
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Fans / Blower
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Conveyer
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Paper & Pulp:
I D Fans
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P A Fans
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In the above industries, the
application of the HARSVERT-A
medium voltage VFD series
achieves smooth speed and flux
control, which saves vast energy
compared with the control of
using the traditional wind shields
or valves. Under certain
circumstances, users'
technological need is the reason
of changing the speed of the fans
and pumps.
The HARSVERT-A
medium voltage VFD series have
remarkably high control
accuracy, which can completely
satisfy the technological
requirements.
The fundamentals
System Principle
System Structure
The structure of HARSVERT-A series medium
voltage VFD is shown in fig A The system is
composed of phase shifting transformer, power
cells and controller. The 3300V series have 12
power cells, and every 4 cells make
Fig. A :System structure of 3.3kV series VFD
up a phase in series. The 6600V series have 18
power cells, every 6 cells make up a phase in
series. The 11000V series have 27 power cells,
and every 9 cells make up a phase in series. The
structures of 3300V, 6600V and 11000V series
VFDs are shown in fig A, B and C.
Fig. B : System structure of 6.6 kV series VFD
Power Cell Structure of HARSVERT-A
Medium Voltage VFD
The power cells are completely identical in
structure, and can be replaced with each
other. The circuit structure is shown in fig 3.2, it is
a basic three phase input, single phase output
AC-DC-AC VFD circuit. The rectifier is a threephase diode bridge. Controlling the IGBT
inverter By sinwave PWM, the output voltage
waveform is shown in fig 3.3.
Fig. C : System structure of 11kV series VFD
overlap rectifier mode greatly improves the line
current waveform quality, and the load power
factor can be improved up to near 1.
In addition, the independence of the
transformer's secondaries makes the power cell’s
main circuit relatively separate, It's similar to the
normal low-voltage VFD, therefore, easy to utilize
the mature technologies
Input Side Structure
The phase shifting transformer supplies power to
each power cell on the input side. The
transformer's secondaries are divided into three
groups; for 3300V series, 24-pulse rectifier mode
is formed; for 6600V series, 36-pulse rectifier
mode is formed; for 11000V series, 48-pulse
rectifier mode is formed. This multi-pulse
Output Side Structure
See fig A and fig B At the output side, each cell's
U and V output terminals are connected in
series to form a star connection to supply power
to the motor. By overlapping each cell's PWM
wave, we can get the multilevel SPWM
waveform shown in fig E It has a excellent sineshape, small dv/dt, no cable and motor
insulation destruction, no output filter for long
output cable, no motor derating, and can be
used in driving the old motor directly. Meanwhile
the motor harmonic is reduced greatly, the
mechanical vibration is eliminated, and the
Fig. E : The PWM Step Wave of the Output phase
voltage of High-Voltage inverter System
A+
R
S
B+
U
K
V
T
A-
mechanical stress of shaft and vanes is
reduced.
When a certain power cell has a fault, by
automatically closing the relay K shown in fig C,
the fault cell can be bypassed out without
effect on other cells and-the VFD can run at a
derated mode; so the loss due to the motor's
suddenly shutting down can be reduced in
many situations.
Building intelligence at every step
Cell Bypass (Optional)
Harsvert-A Drive has a cell bypass
feature which makes the Drive "N-1"
redundant.
Easy to use Operator Interface
Interface Terminal Membrane keypad
includes function keys, cursor selection
key for menu navigation, item selection
and data entry.
Standard operator device cluster
includes, start, stop, and emergency stop
pushbuttons, local/remote selector switch
and local speed potentiometer.
Integral Transformer
Factory wired integral
isolation transformer for easy,
low cost, installation.
Compatible with Standard
Motors without Derating
YANTRA HARVEST
Motor-friendly waveforms have
been the trademark of Harsvert
Drive with near sinusoidal output
current and voltage waveforms at
all speeds and loads. Standard
induction or synchronous motors
are compatible without derating.
Inverter duty motors are not
required.
Qualities that make HARSVERT-A VFD unique
Voltage source VFD, direct input of 3.3,4.16, 6.6, 11 kV, direct output of 3.3, 4.16, 6.6,
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11 kV, no output transformer necessary.
High efficiency.
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High input power factor, no power factor correction devices.
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Low input harmonic current, full accordance with IEEE 519-1992, no input harmonic filters required.
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Sinusoidal multi-level PWM output wavefrom, no output harmonic filters required, directly
connected to the shafts or the vanes, allowing the maximal length of the output cable of 1000m.
Friendly Human-Machine interface, easy to operate.
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Modular design of the power circuits simplifies maintenance routine.
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Medium voltage circuits are connected with controller by the optical fibers, which keep the
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controller safe and away from the disturbance.
Complete fault monitor functions, accurate fault alarm and protection.
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Integrated cooling blower.
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The control logic can be conveniently changed in the integrated PLC.
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Offer both field control and remote control in monitor station.
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Support most of the industrial standard protocois. (Profibus, Modbus, TCP/IP etc.)
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Compatible with industrial standard signal of 0-10V/4-20mA.
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Open loop or closed loop operation with the integrated PID regulator.
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Complete system parameter set-up function of VFD.
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Easy installation.
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Excellent performance/ price ratio.
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Standard Specifications of HARSVERT-A VFD series
Rated Output Capacity
Applicable Motor Output
Output
Rated output Current
Rated input and output Voltage
Input Frequency Tolerance
Input Power Factor
System Efficiency
Output Frequency Scope
Output Frequency Resolution
Overload Endurance
Analogue Input
available
Accel/ Decel Time
Logical Control Input/Output Signals
Ambient Temperature
Storage/Ttransportation Temperature
Cooling Methods
Ambient Humidity
Altitude
Enclosure
Size
Weight
Qualify Assurance
250 - 6250 kVA
200 - 5000 kW
Cell cascaded, Multi-level SPWM output
< 600 A
3300 - 11000 V 10%
45 - 55Hz
0.95 (>20% of full load)
> 0.96 (full load, including the input transformer)
0.5 Hz - 120 Hz
0.01 Hz
120% of rated current for 1 minute; 150% immediately
Four channels, 0 - 10 V or 4 - 20 mA, more channels
0.1 - 3000 sec. adjustable (load dependent)
Expandable by user's need
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0
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0 - 40 C (45 C & 50 C available on demand)
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-40 - 70 C
Air cooling or closed loop liquid cooling
(Liquid to Air/Liquid heat exchanger available)
< 90%, no condensation
Maximum 1000 m above MSL; higher available
IP20, IP21, IP31
(WxHxD) 3300 - 10600 mm x 2480 mm x 1300 mm
3000 - 19000 Kg
ISO 9001:2000